-/**
- * i915_probe_agp - get AGP bootup configuration
- * @pdev: PCI device
- * @aperture_size: returns AGP aperture configured size
- * @preallocated_size: returns size of BIOS preallocated AGP space
- *
- * Since Intel integrated graphics are UMA, the BIOS has to set aside
- * some RAM for the framebuffer at early boot. This code figures out
- * how much was set aside so we can use it for our own purposes.
- */
-static int i915_probe_agp(struct drm_device *dev, uint32_t *aperture_size,
- uint32_t *preallocated_size,
- uint32_t *start)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
- u16 tmp = 0;
- unsigned long overhead;
- unsigned long stolen;
-
- /* Get the fb aperture size and "stolen" memory amount. */
- pci_read_config_word(dev_priv->bridge_dev, INTEL_GMCH_CTRL, &tmp);
-
- *aperture_size = 1024 * 1024;
- *preallocated_size = 1024 * 1024;
-
- switch (dev->pdev->device) {
- case PCI_DEVICE_ID_INTEL_82830_CGC:
- case PCI_DEVICE_ID_INTEL_82845G_IG:
- case PCI_DEVICE_ID_INTEL_82855GM_IG:
- case PCI_DEVICE_ID_INTEL_82865_IG:
- if ((tmp & INTEL_GMCH_MEM_MASK) == INTEL_GMCH_MEM_64M)
- *aperture_size *= 64;
- else
- *aperture_size *= 128;
- break;
- default:
- /* 9xx supports large sizes, just look at the length */
- *aperture_size = pci_resource_len(dev->pdev, 2);
- break;
- }
-
- /*
- * Some of the preallocated space is taken by the GTT
- * and popup. GTT is 1K per MB of aperture size, and popup is 4K.
- */
- if (IS_G4X(dev) || IS_PINEVIEW(dev) || IS_IRONLAKE(dev) || IS_GEN6(dev))
- overhead = 4096;
- else
- overhead = (*aperture_size / 1024) + 4096;
-
- if (IS_GEN6(dev)) {
- /* SNB has memory control reg at 0x50.w */
- pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &tmp);
-
- switch (tmp & SNB_GMCH_GMS_STOLEN_MASK) {
- case INTEL_855_GMCH_GMS_DISABLED:
- DRM_ERROR("video memory is disabled\n");
- return -1;
- case SNB_GMCH_GMS_STOLEN_32M:
- stolen = 32 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_64M:
- stolen = 64 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_96M:
- stolen = 96 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_128M:
- stolen = 128 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_160M:
- stolen = 160 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_192M:
- stolen = 192 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_224M:
- stolen = 224 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_256M:
- stolen = 256 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_288M:
- stolen = 288 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_320M:
- stolen = 320 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_352M:
- stolen = 352 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_384M:
- stolen = 384 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_416M:
- stolen = 416 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_448M:
- stolen = 448 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_480M:
- stolen = 480 * 1024 * 1024;
- break;
- case SNB_GMCH_GMS_STOLEN_512M:
- stolen = 512 * 1024 * 1024;
- break;
- default:
- DRM_ERROR("unexpected GMCH_GMS value: 0x%02x\n",
- tmp & SNB_GMCH_GMS_STOLEN_MASK);
- return -1;
- }
- } else {
- switch (tmp & INTEL_GMCH_GMS_MASK) {
- case INTEL_855_GMCH_GMS_DISABLED:
- DRM_ERROR("video memory is disabled\n");
- return -1;
- case INTEL_855_GMCH_GMS_STOLEN_1M:
- stolen = 1 * 1024 * 1024;
- break;
- case INTEL_855_GMCH_GMS_STOLEN_4M:
- stolen = 4 * 1024 * 1024;
- break;
- case INTEL_855_GMCH_GMS_STOLEN_8M:
- stolen = 8 * 1024 * 1024;
- break;
- case INTEL_855_GMCH_GMS_STOLEN_16M:
- stolen = 16 * 1024 * 1024;
- break;
- case INTEL_855_GMCH_GMS_STOLEN_32M:
- stolen = 32 * 1024 * 1024;
- break;
- case INTEL_915G_GMCH_GMS_STOLEN_48M:
- stolen = 48 * 1024 * 1024;
- break;
- case INTEL_915G_GMCH_GMS_STOLEN_64M:
- stolen = 64 * 1024 * 1024;
- break;
- case INTEL_GMCH_GMS_STOLEN_128M:
- stolen = 128 * 1024 * 1024;
- break;
- case INTEL_GMCH_GMS_STOLEN_256M:
- stolen = 256 * 1024 * 1024;
- break;
- case INTEL_GMCH_GMS_STOLEN_96M:
- stolen = 96 * 1024 * 1024;
- break;
- case INTEL_GMCH_GMS_STOLEN_160M:
- stolen = 160 * 1024 * 1024;
- break;
- case INTEL_GMCH_GMS_STOLEN_224M:
- stolen = 224 * 1024 * 1024;
- break;
- case INTEL_GMCH_GMS_STOLEN_352M:
- stolen = 352 * 1024 * 1024;
- break;
- default:
- DRM_ERROR("unexpected GMCH_GMS value: 0x%02x\n",
- tmp & INTEL_GMCH_GMS_MASK);
- return -1;
- }
- }
-
- *preallocated_size = stolen - overhead;
- *start = overhead;
-
- return 0;
-}
-